31 January 2008

How to grow out tilapia in floating cage

Pembesaran nila di kolam jaring terapung. Growing out fishes has been developoing in Indonesia since 1970, after building Jatiluhur Reservoir, West Java. The first fish which developed is common carp, a kind of fish that very popular in West Java. Other fishes followe after that.

Tilapia can grown out in floating cage. But don’t done in first level, or in the twice levels of floating cages. First level is used to growing out common carps. Tilapias don’t given feed. They feed rest of common carp. It’s one advantage of this system. Culturises must not stock or buy food.

Activities growing out in floating cages are preparation, stocking, and harvest. First preparation are cleaning, and setting. Floating cages cleaned by mosses, for clearing sponges, and bivalves. During cleaning, parts floating cages cecked, torns sowed by other net. For keeling diseases, it drying in the sunshine.

After drying, net twice levels setted, by pulling fourth lines corners of floating cage, and banded to four pillars in fourth corners of frames. Eight pressurer entered there so that net deeped. In this, floating ready to used.

Second preparation is adaftation of tilapia, and common carp fingerling. Fingerling usually live in pond. Pond is distinguish by lake, or reservoir, include water quality, and place condition. Also waves in the pond slowly, and lake, or reservoir higher.

In order to don’t shock to the new situation, tilapia, and common carp fingerlings have to adafted before. Adaftation proses done for 1 – 2 weeks. Adaftation fingerling can done 1 – 2 week before stocking. It’s better than the first.

If floating second levels has setted, tilapia fingerlings stocked there by density 100 – 200 kg/ floating cage. After stocking tilapia fingerling, floating cage first level setted, too. After that, common carps fingerling stocked there, by density 300 – 400 kg/ floating cage.

Everyday, common carps fed by artificial feed. Feeding done by adlibitium system, that is fed if it seen hunger, and stoped if it satisfied. It seen by its behaviour. Common carp wiil go out of feed if satisfied. Otomaticaly, tilapia don’t fed. These will fed rest feed of common carp.

Tilapia harvested after ending growing time. Common carp harvested before. Harveting done by pulling two corner of floating cage to one of side. After narrow, common carp catched. After catching common carp, tilapia harvested, too. Its method same by common carp harvest. In a floating can be produce 300 – 400 kg consumtion.